WASHINGTON – The Obama administration said Wednesday it is providing a loan guarantee for a massive solar energy project that could double the number of glimmering solar panels on residential rooftops in the U.S.The Energy Department said it provided a partial guarantee for a $344 million loan to San Mateo, Calif.-based SolarCity for the SolarStrong Project, which seeks to place solar panels on 160,000 homes across 124 military bases in 33 states."This is the largest domestic residential rooftop solar project in history," Energy Secretary Steven Chu said in a news release. "This groundbreaking project is expected to create hundreds of...